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As Kraigwy said, you can find South with an analog watch or you can make a rough sundial if you have a digital. Point the hour hand at the sun and halfway between the hour hand and 12 is relative South.
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I often use this method, but it has limitations. The major limitation is that within the tropics, where I used to spend a good deal of time, you have to know were you are in relation to the equator and the relative position of your general latitude to that of the celestial latitude of the sun. Of course is you are in the extratropical latitudes of the Southern Hemisphere, the method renders North.
Having been a professional navigator for several years, you pick up all kinds of tricks. For gross reference at night, I tend to use Orion, if the Pole Star is not visible. In the Southern Hemisphere, Crux is valuable the same way.